Method of making u-shaped pipe-bends.



P. ESOH.

METHOD OF MAKING U-SHAPED PIPE BENDS.

APPLIUATION FILED MAY 1, 1918.

Patented Oct. 7, 1913.

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ATTORNEYS /IIIIIIIIIIIIII"' I/Il/I/IIIIIII/ WIT/#58858 rnrnn ESCH, or npssnnnonr, GERMANY, essmnon T9 soimunrsonn I-IEISSDAMPF GEsELLscHArr, M. B. 11., or oessrzn, GERMANY, A CORPORATION OF GERMANY.

ME'IHQD Q13 MAKING U-SHFPEI.) lllLPIEl-BENDS.

Specification of Letters Ba en Patented Oct. 7, 1913.

Original application flied :September 22, 1910, Serial No. $13,171. Divided and this application filed May 1,

1913. Serial No. 7 4,775

To all whom i may concern Be it known that EEPETER Eson, a subgect of the German nperor, and a resit of se dor G rma y, v in ent d r ain new and useful Improvements i Methods of Making U-Shaped Pipe-Bends, of which the following is a specification.

This application is a division of my application slmilarly entitled, filed September 22, 1910, Serial No. 583,171.

My invention concerns themaking of U- shaped pipe bendsand particularly such bends when used in connection with boilers, superheaters and generally when exposed ohigh temperatures r when used to car y steamor fluids under pressure.

y ven ion re ates pa t ular y to such beads as aforesaid when the two legs of the bend are required to be Very close together.

A'primary object of my invention is to provide a method-of making pipe bends which shall involve very simple tools and acces- F BS nd'fin in xpen i labor factor and yet result in the. production of bends of great strength and uniform character,

Other ob]ects of my inyeutio will ap- 5 pear as the specificat on procee s.

My improved method of making U- Shaped pipe be ds. ons t es n i ly i first preparing by any suitable methQd an element comprising two lengths of tube connected by a bridge piece and then welding to such bridge piece and'the adjacent tube ends the edge or rim ofan appropriate bell or dome-shaped cap.

Referring to the drawings, Figure 1 represents a central section through the two legs of a.preferred form of. U bend made according to my invention; Fig. 2 is a sect1on taken on' the line 2-2 of Fig. 1; Figs.

. 3 and 4 show the first and second steps in the production of the element to which the cap isto be welded; Fig. 5 is a plan View of Fig. 4; Fig. 6 represents a longitudinal section through a preferred form of cap; Fig. 7 is a section taken along the line 7 7 of Fig. 6; Fig. 8 is a sectional plan view taken from below of Fig. 6; Fig. 9

is a longitudinal section taken on the longer axis of the flattened tube from which the cap of Fig. 6 is made;Fig. 10 is across the two steps of the method; Fig. 12 shows a mQdified form of cap together with a mandrel used in this construction.

The form of bend shown in t e figures is Preterably mad as f llow suitable bore and wall thickness is selected and a pair o transverse cuts made nearly through, the incomplete ring lying between these cuts then being removed; this results in apair of ends, a, Z) connected by a narrow bridge-piece ,0. These two legs a, b are th n bent downwardly about a transverse axis through the bridge piece 0 (Fig. i) and constitute the legs of the bend which i to be formed; the l ngth of the bridge piece 0, itself fixed by the distance between the original cuts, determines the distance between the l gs. To complete the U bend a flattened piece of tube 6, (Figs. 9 and 10), the cross-section of which is that its .curyes will coinpide with the curves of the two lengths or, b, is employed. This tube is mounted upon a mandrel d, (Fig. 11) and its free end or edge suitably folded or formed upon the mandrel until it assumes the shape shown dotted in Fig. 11,

the butt-joint being finally closed by 'welding. The cap f thus produced has its sides bent inwardly (Figs. 7 and 8) so as to contube of or special requirements may dictate. Furthermore, instead of forming the cap f from a piece of flattened tube mounted upon a mandrel, I may, if I desire, make this cap by pressing from a single piece of metal. Other ways of making-this cap ma conceivably be employed.

An advantage of making tube bends in the manner described is that it is unnecessary to do any welding in the often very narrow and unaccessible portign lying between the two. legs a, b. (Fig. 4;). Furthermore, in forming the bend, it is only necessary to handle two elements, namely, the two tube lengths connected by the bridge piece and the cap.

When the caps are made as has just been described for Figs. 9 to 12, the thickening or reinforcement of the tip or cap is obtained entirely from the material of the cap itself and results naturally from the folding over of the tube edges. This thickening at this particular point is very desirable, as it is at this point as a rule that the bend is exposed to the hottest furnace gases. The known method of adding extra material by welding is obviously more expensive as well as less durable and strong.

The process and product as above described substantially utilizes all the raw material, while possessing the-additional advantage that'the legs of the bend may be placed as close together as may be desired.

Having described my invention, I claim:

1. The method of making pipe bends which consists in removing an incomplete ring from a length oftube so as to produce two legs united by a bridge piece, bending said legs in a plane perpendicular to the bridge piece, and then uniting the open edges of a cup-shaped or hollow cap to the edges of the bridge piece and adjacent legs, substantially as and for the purpose described.

2. The method of making pipe bends which consists in removing an incomplete ring from a length of tube so as to produce two legs united by a bridge piece, bending said legs symmetrically to said bridge piece in a planeperpendicular thereto, and then uniting the open edges of a cupshaped or hollow cap to the edges of the bridge piece and adjacent legs substantially as and for the purpose described.-

'8. The method. of making U-shaped' pipebends which consists in removing an incomplete ring from a length of tube so as to produce two legs having squared ends and and then uniting the open edges of a cupshaped or hollow capto the edges'of the bridge-piece and adjacent legs, substantially as and for the purpose described."

5. The method of making U-shapedpipe bonds which consists in making two parallel.

transverse cuts nearly throughfa length of; 4 tube and removing the incompletei'rmgthereby formed so as to. producetwo-lcgs having squared ends and united by a bridge piece, bending said legs symmetrically 'in a making ,pipe

plane perpendicular to the bridge til substantially parallel with one another g and then uniting the open edges of a cup-- shaped or hollow cap to the' 'e'dges of the bridge piece and adjacent legs, substantially as and for the purpose described.

. In testimony whereof, I have'h'ereunto set my hand and seal in thejpresence of two subscribing witnesses. v 7

P TER ESOH. [1 s.']

Witnesses:

PETER REINHABD, Gus'mv Pawns. 

